Furnace-eyesight



E. G. ZIMMERMAN. FURNACE EYESIGHT. APPLICATION FILED, MAY 17'. 1920.

Allllllllllllllllllllllllll i UNITED STATES PATENT OFFICE.

EDWARD G. ZIMMERMAN, OF NEW CASTLE, PENNSYLVANIA, ASSIGNOR TO AMERI- CAN DRESSLER TUNNEL KILNS, INC., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

Specification of Letters Patent.

F'URNAGE-EYESIGHT.

Patented May 3, 1921.

T 0 all whom it may concern:

Be it known that I, EDWARD G. ZIMMEn- MAN, citizen of the United States, and resident of New Castle, in the county of Lawrence and State of Pennsylvania, have invented certain new and useful Improvements in Furnace-Eyesights, of which the following is a specification.

My present invention consists in an improved furnace eye sight, or inspection window, through which the interior of a kiln or other furnace chamber may be viewed, and was devised with the object of providing a simple and effective construction in which the glass or transparent window proper, is so mounted in its casing that it may be easily replaced when necessary without putting any force on the window casing tending to dislocate the latter.

The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of the invention, however, and the advantages possessed by it reference should be had to the accompanying drawings and descriptive matter in which I have illustrated and described a preferred embodiment of the invention.

Of the drawings:

Figure 1 is a sectional elevation of a portion of a kiln furnace wall, with my improved eye sight mounted therein;

Fig. 2 is an enlarged section of a portion of the eye sight; and Fig. 3 is an end view of the eye sight.

In the drawings, A represents the wall of a furnace and A an opening therein through which a view may be had of the interior of the furnace chamber. Inserted in the outer end of the opening A, is a tubular metal part B which forms the casing for the glass C. Ordinarily the casing B is held in the opening A by mortar. The casing B projects outward from the furnace wall and is internally enlarged at its outer end to provide an annular seat B for the circular glass C. In the cylindrical portion B of the part which surrounds the glass C, an internal groove B is formed to receive the spring D by which the glass is normally held in place. The spring D is formed of a piece of wire bent into a circular arc of a little less than 360 and has end portions comprising radial parts D and parts D parallel to the axis of the arc. The normal external diameter of the circular body portion of the spring D is greater than the internal diameter of the cylindrical wall B so that the spring is normally held by its own resilience in the groove B The end portions D form handles which may be squeezed together to withdraw the spring from the groove B By proportioning the parts, as shown in Fig. 2, so that the glass will prevent the spring from seating directly against the bottom of the groove B the glass will be held snugly against the seat B. the spring D and groove B are circular in cross section though other shapes may be employed.

The described construction is obviously simple and eflective. Accurately shaped seats for the glass C, and the spring D may be made with a minimum of machining. A fractured glass or one becoming so coated As shown in use as to impair its transparency may be quickly and easily replaced by a perfect glass. Furthermore this replacement may be effected without putting any force on the casing part B tending to rotate it or otherwise loosen it in its mortar seat in the furnace wall.

Having described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A furnace eyesight comprising a tubular part adapted to be anchored in a furnace wall and having its outer end internally enlarged to provide an annular seat for a glass extending across the bore of the portion of said tubular part at the furnace side of said seat, and formed with a groove in the inner surface of the enlarged portion of the part to receive a split ring spring for clamping said glass against said seat.

2. A furnace eyesight comprising a tubular part adapted to be anchored in a furnace wall and having its outer end internally enlarged to provide an annular seat, a glass engaging said seat and extending across the bore of the portion of said tubular part at the. furnace side of said seat and formed with a circumferential groove in the inner surface of the enlarged portion of said port, and a split ring clamping spring adapted to be sprung into and out of place in said groove and When in place therein to hold. said glass against said seat.

Signed at New Castle,. in the county of Lawrence and State of Penn. this 10th day of May, A. D. 1920.

EDWARD G. ZIMMERMAN. 

